98 Chev Wont Stay Running

d3athsong · August 17, 2009

Im hoping someone might have an idea what this problem might be. My dad has a 98 chev with a 5.7l. It started fine this morning when he moved it outside to clean the shop. After lunch, went to start it up and it fired and died. After repeated tries, it will crank, fire, then die within about 1 second. No light comes on on the dash. We also thought it might be a passlock thing, so we tried the other key, and still no go. It's like the fuel is getting shut off as soon as it fires. Anybody have any ideas what might be wrong?

2COR517 · August 17, 2009

Try crimping off the return line on the fuel rail. Do this on a rubber hose section.

kchasse · August 18, 2009

To me it sounds like the oil pressure switch. The Fuel receives power on crank mode through the ignition switch then once the key is released and there is oil pressure the feed for the fuel pump is through the oil pressure switch which is behind the distributor. It is a kind of safety so if you lose oil pressure your truck will shut off.

d3athsong · August 18, 2009

Got it fixed, hopefully for good. My dad has had this truck for a few years and has put on maybe 20000km's of the 286000. We called the local dealer and the head mechanic thought it might not have enough fuel pressure. After the effort put into removing the fuel filter, we decided it had probably never been changed and replaced it with the one i took out of my 94 jimmy when i changed the fuel pump. After a few cranks, it fired up adn is runnign great.